Drier



Jan. 25 1927.

c. H. GREENWOOD y DRIER Filed Nov. 9.l 1192 \,///////////////////V l lINVENTOR Patented Jan. l25, 192.7.

UNITED STATES PATENT OFFICE..

CHARLES H. GREENWOOD, OF LA SALLE, NEW YORK, ASSIGNOR TO THE CARBORUN-ID'UM COMPANY, 0F NIAGARA FALLS, NEW YORK, A CORPORATION 0F PENNSYL-VANIA.

DBIER.

appueation med November '9, 1925. serial No. 67,758.

lates more particularly to means for'efl'ectively heating the drier.

According to the present invention it is i proposed to provide means vbywhich oil may be used as a fuel for heating the shell of a. drier'without burning the drier or prof ducing hot spots or withoutundesirable effects.

It is well understood by those skilled in the art that the burning ofoil requires a temperature in the combustion chamber of approximately1,600" F This-is far too l5 hot for the ordinary type of drier. If,therefore, oil is to be used as a fuel it is necessary that it be burnedefficiently.

By means of the present invention it is possible to burn the oil underlmore efficient conditions and yet preventburning of the shell of thedrier.

The intention may be readily' understood by reference to the accompanymgdrawings which illustrate more orless diagrammati- Vcally one embodimentof the invention, but it will be understood that I do not confine myselfto the particular` construction therein disclosed as various changes andmodifications are contemplated within the scope and spirit of myinvention. v

In the drawing:

Figure 1 represents a longitudinal ver. tical section through a drierheated in accordance with my invention; and

Figure 2 represents a vertical transverse section in the plane of lineII-II of Figure 1.

Referringmore particularly to the drawing,l 5 designates a chamber orhousing for the drying shell 6 which is preferably of the rota type.` Atone end of the `shell 6, whic is of the usual construction, is a supplyho per 7 through which a material to be dried) may be introduced intothe shell and at the opposite end of the shell is a d1sch'ar e hopper 8.Supported on a suitable foun ation 9 within the chamber 5-and below theshell -6 is a suitable combustion chamber 10 having an oil burner 11 atone end thereof. Y Y

, The combustion chamber 10 is vof a refractory nature Ihaving walls ofhighv thermal conductivity. It is preferred that this chamber be made.of silicon.i carbide, this A pel.

substance being highly refractory and yet bein a good conductor ofheat.- The end 12 'o the chamber opposite the burner 11 is In theoperation of the drier the oil is combusted Withiuthe chamber 1-0 at ahigh temperature. The walls of the chamber belng' a good conductor ofheat radiate a considerable amount of heat of combustion dibe led` fromthe chamber 5 into the discharge end of the shell 6. At the oppositevend ot' the shell 6 is a pipe 14 through which gases may bewithdrawnfrom the interior of the shell, andaI fan 15 may, if desired, beemployed to insure of the proper circulation of 7;

gases. The hot gases circulating about the chamber 5 flow through thepassagel where they contact directly with the material in the shell tobe dried. f In this manner the material to be dried is heated by directradiation from the combustion chamber 10, then heated by the circulationof gases outside of the shell and further heated and dried bv thepassage of thehot gases through the shell. By reason ofI the "fact thatthe oil is initially burned within the refractory combustion chamber 10the high temperature flame does not-impinge directly against the wallsof the shell to burn or otherwise destroy them. At the same time, heatis effectively radiated so that the heat is used efficiently. By thetime that the gases of combustlon emerge from the 'open end of thechamber -10 they have cooled suiiciently that their circulation directlyabout the shell is not injurious. After they `have passed throu h theconduit 1-3 they are suflficiently 'coo so that they can be safelypassed through the'shell without ydanger of lnjfury to the material tobe dried or without injury to the shell itself.

I claim:

1. The combination with a drier of means drier through which hotLgasesfrom the radi- 'ating combustion chamber may llo'w, and a conduitleading from the circulating chamber into the drier and means forwithdrawing gases from the drier.

2. The combination with a drier and a chamber Within which the drier ismounted, of a silicon Carbide combustion chamber within the heatingchamber and below the drier.

3. The combination. with a drier and a heating chamber within which thedrier is mounted, of a silicon carbide combustion chamber within theheating chamber and below the drier, said combustion chamber having afuel burner at one end thereof and having'its other end opening into theheating chamber.

4. The combination with a drier and a heating chamber within which thedrier is mounted, of a silicon carbide combustion chamber within theheating chamber and below the drier, said combustion chamber having afuel burner at one end thereof and having its other end opening in'tothe heating chamber, and means for conducting gases from the heatingchamber into the drier.

5. The combination with a cylindrical rotary drier and a 'heatingchamber within which the drier is mounted, of a silicon carbidecombustion chamber within the heating chamber and extendinglongitudinally under the drier, said combustion chamber having a fuelburner at one end thereof and having its other end opening into theheating chamber.

6. The combination with a horizontally arranged cylindrical rotary drierand a heating chamber within which the drier is mounted, on an oilburner below the drier, a silicon carbide heating chamber extendingforwardly under the drier from the fuel burner, said Combustion chamberopening into the heating chamber, and a conduit leading from the heatingchamber into one end of the shell of the drier.

"7., The combustion with a horizontally arranged cylindrical rotarydrier and a heat- Aing chamber within which the drier is mounted, of anoil burner below tlie drier, a silicon carbide heating chamber extendingforwardly under the drier from the fuel burner, said combustion chamberopening into the heating chamber, a conduit leading from the heatingchamber into one endof the shell of the drier, and means connected withthe other end of the Shell of the drier for drawing gases through theshell.

8. T he combination with a drier and an enclosing structure therefor ofa combustion chamber within the enclosing structure and below the drierwhichis highly refractory and which is a good conductorof heat, and afuel burner at one end of said combustion chamber.

9. The combination with a rotary drier and an enclosing structuretherefor, of a silicon carbide combustion chamber in the-'enclosingstructure under the drier having a fluid fuel burner at one end thereofand having its other end opening into the enclosing structure.

v In testimony whereof I have hereunto set my hand.

,cI-nuance` H. GREENWOOD.

